bc: for(;;) fix from upstream

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/testsuite/bc.tests b/testsuite/bc.tests
index d33f8c9..edff209 100755
--- a/testsuite/bc.tests
+++ b/testsuite/bc.tests
@@ -51,6 +51,11 @@
 	"2\n9\n" \
 	"" "if (0) 1 else if (1) 2; 9"
 
+testing "bc for(;;)" \
+	"bc" \
+	"2\n3\n2\n9\n" \
+	"" "i=2; for (;;) { 2; if(--i==0) break; 3; }; 9"
+
 testing "bc define auto" \
 	"bc" \
 	"8\n9\n" \